ARCHIVED REPORTS_MONITORING WELL INSTALLATION REPORT - SITE ASSESSMENT WORK PLAN

Home Browse Search

lie 25 February 2005 AGE-NC Project No. 98-0500/04-1127 Page 3 of 7 1 Classification System(Appendix B). Soil vapor was monitored in sample collected above the water table utilizing an organic vapor meter(OVM) equipped with a photo ionization detector. ' 2.1.3. Well Completion Pilot boring MW-36 was completed as a deep(hydrogeologic unit: HU6), ground water well using two-inch diameter PVC casing with 0.020-inch slotted screen installed from approximately 145 to 150 feet bsg, with blank casing extended to the surface. The filter pack(No. 3 Lonestar sand) was installed from approximately 142 feet to 150 feet bsg, then an 6-foot bentonite pellet plug was installed above the filter pack and allowed to hydrate. Boring MW-37 was completed as a deep, (hydrogeologic unit:HU7)ground water well using two-inch diameter PVC casing with 0.020-inch slotted screen installed from approximately 195 to 200 feet bsg,with blank casing extended to the ' surface.The filter pack(No.3 Lonestar sand)was installed from approximately 195 feet to 200 feet bsg,then an 5-foot bentonite pellet plug was installed above the filter pack and allowed to hydrate. The wells were then grouted to near the surface with bentonite-cement grout, and a water-tight, traffic-rated well box installed over the well. As-built well diagram are depicted on the boring log ' . in Appendix B. 2.2. WELL MONITORING DEVELOPMENT AND SAMPLING PROCEDURES The development and initial sampling of ground water monitoring wells MW-36 and MW-37was ' performed on 18 January 2005. i2.2.1. Monitoring Well Development On 18 January 2005,monitoring wells MW-36 and MW-37 were developed utilizing a stainless steel hand bailer and an pneumatic pump. The depth to ground water in each well was measured to the nearest 0.01-foot from the top of each well casing utilizing a Solinst water level meter;and the total depth of the wells were measured prior to and after the development process. Approximately five ' gallons of ground water and silty-sand was removed from each of the well casings. Then ground water was purged from each monitoring well until ground water was visually sediment free. Approximately 30 gallons of water were removed from the well MW-36; however, the well was ' almost purged near dry, suggesting slow recharge in this well. Approximately 70 gallons of water were removed from well MW-37,a three casing-water volume. Ground water temperature,pH and ' conductivity were measured at regular intervals during purging using an Oakton water analyzer. Field sheets and data are included in Appendix C. Purged water was stored on-site in properly • ' Advanced GeoEnvironmental,Inc.